Getting it into your agent
This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.
/plugin marketplace add mayank-io/mstack/plugin install fetchWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/mayank-io/mstack/ig-post)<a href="https://agentmods.dev/skills/mayank-io/mstack/ig-post"><img src="https://agentmods.dev/badge/skills/mayank-io/mstack/ig-post/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/mayank-io/mstack/ig-post"><img src="https://agentmods.dev/badge/skills/mayank-io/mstack/ig-post.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00086 | $0.01873 |
| Opus 5.5 | $0.00034 | $0.00749 |
| Sonnet 5.5 | $0.00017 | $0.00375 |
| Haiku 4.5 | $0.00009 | $0.00187 |
Grade A, and why
ig-post scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 134 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Fetch Instagram Post
Pull an Instagram reel or post — caption, author, metrics, media — into a directory, and transcribe the audio. This skill knows nothing about vaults; it retrieves and stops. notes:clip turns the result into a note.
The one thing that makes this skill necessary
On a reel, the caption is not the content. A 90-second talking-head reel carries its argument in the audio; the caption is a teaser ending in "comment INFLUENCE below". Capturing the caption and stopping produces a note that looks complete and contains none of the substance. Always transcribe.
Input
- First argument — Instagram URL (required):
instagram.com/reel/<id>,/p/<id>, or/tv/<id>. Strip?igsh=…share params. - Second argument — output directory (optional). Omitted, a temp directory is used. Created if missing. Never write outside it.
Step 1 — The browser must be gstack, and logged in
Instagram shows a login wall to logged-out sessions. Critically, the wall still renders the author, caption and metrics in the OpenGraph tags, so a logged-out capture yields a plausible-looking result with no video and no transcript. That is the failure this skill exists to prevent.
B="$HOME/.claude/skills/gstack/browse/dist/browse"
"$B" status # must report `mode: headed`
"$B" connect --force-restart # only if it does not
Then confirm the Instagram session specifically — headed is necessary but not sufficient, because the user can be logged into X and not Instagram:
() => ({
loggedIn: !!document.querySelector('svg[aria-label="Home"], a[href="/direct/inbox/"]'),
loginWall: /Log in|Sign up/i.test(document.body.innerText.slice(0, 400))
})
If loggedIn is false, stop and ask the user to log in inside the gstack browser, then poll until they have. Do not fall back to a logged-out capture.
⚠️ Do NOT disconnect when done — it tears down the daemon and the user's sessions with it.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 1mo ago First seen · 134 lines · 86 tokens per session scan A 79262380a5d6
ig-post is a skill published in the GitHub repository mayank-io/mstack (6 stars, last pushed 3d ago), licensed MIT. It adds 86 tokens to every session and 1,873 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-13.
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